Piston



F. G. HAAS.

PISTON.

APPLICATION FILED MAY 24, I916.

Patented Mar. 2, 1920.

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UNITED STATES PATENT OFFICE.

FERDINAND G. HAAS, OF ST. PAUL, MINNESOTA.

PISTON.

To all whom it may concern:

Be it known that I, FERDINAND G. I'IAAS, a citizen of the United States,residing at St. Paul, in the county of Ramsey and State of Minnesota,have invented new and useful .lmprovements in Pistons, of which thefollowing is a specification.

My invention relates to improvements in pistons of the class illustratedand described in Letters Patent No. 1,092,834, issued to me April 14,1914, in which is disclosed a piston comprising a head, a plurality ofperipheral sleeves slidable longitudinally on the head, resilientpacking rings between the ends of the sleeves, and compression membersto shift the sleeves and thereby expand said rings radially.

It is the object of my present invention to simplify pistons of thistype, to reduce the weight thereof, preserve durability and promoteefliciency.

A further object is to protect certain novel features of constructionhereinafter described and pointed out in my claims.

In the drawings, Figure 1 isa central longitudinal sectional. view of myimproved piston; Fig. 2 is a transverse sectional view taken on the line2-2 of Fig. 1; and Fig. 3 is a plan of said piston.

Referring to the drawings, my piston comprises generally a head A,consisting of a hollow cylindrical core 11 having an end 12 and aperipheral shoulder 13 at one extremity, and piston sleeves 14 and 15.Up

posed segments are cut away from the annular wall of the core 11,between the ends thereof, to lighten the piston and for another purposehereinafter described. The up er end of the core provides an annulus orcaring 16 for one end of the sleeve 14 and the lower end of said coreprovides a similar annulus or hearing 17 for the other end of saidsleeve and also for one end of the second sleeve 15. Bosses 18 areformed within the core 11 to receive a wrist-pin 19, and said core 11and bosses 18 are reinforced by ribs 20, 21 and 22. The piston sleeves14 and 15 are slidable longitudi nally upon the core 11 and fit snuglythereon. As shown, I have provided upon the inner peripheries of saidpiston sleeves 14 and 15 a number of annular and longitudinalreinforcing ribs. One rib 23 is formed at each end of each sleeve, and asimilar rib 24 near the middle thereof, while longitudinal ribs 25 arespaced at intervals Specification of Letters Patent.

Application filed May 24, 1916.

Patented Mar. 2, 1920. Serial No. 99,542.

between said annular ribs 23 and 24. The sleeve 14 is placed upon thecore 11, one end bearing upon the annulus 16 and the other end on theannulus 17. A resilient packing ring 26 is placed around said annulusand between the piston sleeve 14 and flange 13. The sleeve 15 is placedupon the core 11, one end thereof encircling the annulus 17, and asecond resilient packing ring 27 is inserted between the adjacent endsof the sleeves l4 and 15. Said sleeves may be shifted longitudinallyupon the core by compression devices to be presently described, toexpand the resilient packing rings-radially against the walls of acylinder. To facilitate in this expansion of the rings, I have beveledthe ends of the sleeves 14 and 15 and the lower side of the flange 13,as clearly illustrated in Fig. 1. The sleeve 15 is furnished at itslower end with horizontal flanges 28 which are enlargements of the lowerrib 23. The compression de vices are bolts 30. These bolts, threaded attheir ends in the bosses 18 and passing through the wrist-pin 19 in saidbosses, also pass through perforations 29 in said flanges 28. Nuts 31and 32 upon each bolt are arranged at opposite sides of the flange 28through which said bolt passes Said nuts 31 are employed to secure thepiston sleeves 14 and 15 upon the core 11 and to shift said sleeves andthe nuts 32 serve as locks to prevent the loosening of said first nuts.

It will be noticed, that in addition to shifting and securing thesleeves 14 and 15 upon the core 11, said bolts 30 secure the wrist-pin19 against movement in the bosses 18 and further hold the lower end ofthe sleeve 15 in alinement.

The piston sleeve 14 is perforated in a number of laces to formlubricating ducts 33. These ducts open within said sleeve at the upperedge of the intermediate annular rib 24 and oil accumulating upon saidribs is conducted through these perforations to the oil groove 34adjacent to the wall of the cylinder surrounding the piston. Theopenings in the core 11 formed by removing segments from its annularwall, as above described, are so proportioned that they oommunicate withthe oil ducts 33 in all adjustments of the sleeve 14, thus permittingthe unobstructed passage of vaporized lubricant and the splash of oil tothe oil ducts 33.

The resilient packing rings should be formed of a composition adapted toresist heat and wear and contain no lubricant. Such material as asbestosand ground fiber is preferred, or asbestos alone may be employed, butapplicant does not limit himself to any particular fibrous material orcomposition.

Having described my invention, what I claim as new and desire to protectby Letters Patent, is:

1. In a iston, a hollow cylindrical core having ope ings in its annularwall between the ends thereof, a plurality of peripheral sleevesslidable on said core, resilient packing rings encircling the core andadapted to be compressed between said sleeves, devices to shift andsecure the sleeves upon said core, one of said sleeves being formed withoil ductsin its annular wall communicating with the openings in saidcore in all positions of ad ustment of said sleeve.

2. In a piston, a hollow cylindrical core having a peripheral flangethereon, bosses within the core, a wrist-pin mounted at its ends in saidbosses, a peripheral sleeve slidably mounted upon said core, a resilientpacking ring between said flange and the adjacent end of said sleeve, asecond peripheral sleeve slidably mounted at one end on said core, asecond resilient packin ring between the adjacent ends of said s eeves,bolts secured in said bosses and passin through said wrist-pin and nutson said bolts (:06 erating with said second sleeve to shift s'ai sleevesand expand said rings radially.

3. In a piston, a hollow cylindrical core having a peripheral flangethereon, bosses within the core, a wrist-pin mounted at its ends in saidbosses, a peripheral sleeve slidably mounted upon said core, a resilientpacking rin between said flange and the adjacent en of said sleeve, 3.second peripheral sleeve slidably mounted at one end on said core, asecond resilient packin ring between the adjacent end of said s eeves,bolts secured in said bosses and passing through said wrist-pin, andnuts on said bolts coiiperating with said second sleeve to shift saidsleeves and expand said rings radially, said bolts being also adapted toform bearings on the otherwise unsupported end of said second sleeve.

&. In a piston, a hollow cylindrical core having openings in its annularwall between the ends thereof, a plurality of peripheral sleevesslidable on said core, resillent packing rings encircling the core andadapted to be compressed between said sleeves, devices to shift andsecure the sleeves upon said core, one of said sleeves having an annularrib upon its inner periphery and bein formed with oil ducts in itsannular wa which are inclined downward from the upper edge of said rib,said oil ducts communicating with the openings in said core in allpositions of adjustment of said sleeve.

5. In a iston, a hollow cylindrical core, bosses wit in the core adaptedto receive a wrist pin, a plurality of peripheral sleeves slidable onsaid core, a resilient packing ring between adjacent ends of saidsleeves, bolts secured in said bosses and nuts on said boltscoiiperating with one of said sleeves to shift the same.

Whereof, I have hereunto subscribed my name to this specification.

FERDINAND G. HAAS.

